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[FEATURE] Add support for BM25 indexing and retreival
Describe the feature you'd like Add support for BM25 indexing and retrieval for the document store
Additional context I was exploring how to improve RAG accuracy and came across this concept of contextual retrieval (https://www.anthropic.com/news/contextual-retrieval). This mentions BM25 and fusion of results from semantic and BM25 search and then reranking.
Another reference (https://medium.com/@kachari.bikram42/from-search-to-synthesis-enhancing-rag-with-bm25-and-reciprocal-rank-fusion-872d21dc4ca7)
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